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Related Experiment Videos

Heparin binding to resting and activated platelets.

M K Horne1, E S Chao

  • 1Clinical Pathology Department, National Institutes of Health, Bethesda, MD 20892.

Blood
|July 1, 1989
PubMed
Summary

Heparin binds to platelets, potentially explaining its side effects like thrombocytopenia. Activated platelets reveal more binding sites, suggesting a role in platelet adhesion and dysfunction during heparin therapy.

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Area of Science:

  • Hematology
  • Pharmacology
  • Biochemistry

Background:

  • Heparin is known to inhibit platelet function and can induce thrombocytopenia.
  • Understanding the molecular mechanisms of heparin-platelet interaction is crucial for managing its clinical effects.

Purpose of the Study:

  • To investigate the binding characteristics of heparin to human platelets.
  • To determine if heparin binding sites on platelets are altered upon platelet activation.

Main Methods:

  • Quantification of (3H)-heparin binding to resting and stimulated platelets using platelet-rich plasma and gel-filtered platelets.
  • Assessment of binding in the presence of various agonists like thrombin and adenosine diphosphate (ADP).
  • Evaluation of the role of extracellular calcium and specific platelet membrane glycoproteins in heparin binding.

Main Results:

  • Resting platelets exhibit a single class of saturable heparin binding sites with a specific affinity.
  • Platelet activation, particularly with thrombin, leads to the appearance of a second, low-affinity, high-capacity class of heparin binding sites.
  • ADP-induced platelet release, but not primary aggregation, also increased heparin binding.
  • Heparin binding was independent of extracellular calcium and specific platelet membrane glycoproteins.

Conclusions:

  • The high-affinity heparin binding sites on resting platelets may be involved in heparin-induced platelet dysfunction and thrombocytopenia observed in clinical settings.
  • The low-affinity, high-capacity sites that emerge upon platelet activation could play a role in platelet adhesion processes.

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